IsMouseOver对DockPanel

Question

我试图检测鼠标何时进入VS 2017标题栏，但我发现MouseEnter和MouseLeave事件无法正常工作。只有当鼠标进入下面屏幕截图中绿色矩形所示的子控件时，才会触发事件。

标题栏是DockPanel，其中包含一些元素。我已将其背景设置为SolidColorBrush(Colors.Red)，以确保点击测试正确运行。当鼠标悬停在绿色矩形IsMouseOver中的元素时，正确返回true，但在其他任何地方都是false。对于菜单栏，IsMouseOver和MouseEnter以及MouseLeave事件正常工作。那可能有什么问题？

更新2：标题栏很可能被标记为非客户区域，这就是导致此问题的原因

更新

这是主VS窗口的Visual Tree：

已解压缩MainWindowTitleBar类：

using Microsoft.VisualStudio.PlatformUI.Shell.Controls;
using Microsoft.VisualStudio.Shell;
using System;
using System.Windows;
using System.Windows.Automation.Peers;
using System.Windows.Controls;
using System.Windows.Input;
using System.Windows.Interop;
using System.Windows.Media;

namespace Microsoft.VisualStudio.PlatformUI
{
    public sealed class MainWindowTitleBar : Border, INonClientArea
    {
        protected override HitTestResult HitTestCore(PointHitTestParameters hitTestParameters)
        {
            return new PointHitTestResult(this, hitTestParameters.HitPoint);
        }

        int INonClientArea.HitTest(Point point)
        {
            return 2;
        }

        protected override AutomationPeer OnCreateAutomationPeer()
        {
            return new MainWindowTitleBarAutomationPeer(this);
        }

        protected override void OnContextMenuOpening(ContextMenuEventArgs e)
        {
            if (!e.Handled)
            {
                HwndSource hwndSource = PresentationSource.FromVisual(this) as HwndSource;
                if (hwndSource != null)
                {
                    CustomChromeWindow.ShowWindowMenu(hwndSource, this, Mouse.GetPosition(this), base.RenderSize);
                }
                e.Handled = true;
            }
        }
    }
}

为MainWindowTitleBar提取XAML：

<mwtb:MainWindowTitleBar Name="MainWindowTitleBar" x:Uid="vs:MainWindowTitleBar_1" Grid.Row="0" Grid.Column="0" Background="{DynamicResource {x:Static ui:EnvironmentColors.MainWindowActiveCaptionBrushKey}}" TextElement.Foreground="{DynamicResource {x:Static ui:EnvironmentColors.MainWindowActiveCaptionTextBrushKey}}">
  <DockPanel x:Uid="DockPanel_2">
    <wcp:SystemMenu Name="SystemMenu" x:Uid="Image_1" Source="{TemplateBinding Window.Icon}" VectorFill="{DynamicResource {x:Static ui:EnvironmentColors.MainWindowActiveIconDefaultBrushKey}}" Width="32" Height="27" Margin="0,0,12,4" Padding="12,7,0,0" DockPanel.Dock="Left" VectorIcon="{Binding Source={x:Static Application.Current}, Path=VectorIcon}" />
    <StackPanel Name="WindowTitleBarButtons" x:Uid="WindowTitleBarButtons" Orientation="Horizontal" DockPanel.Dock="Right">
      <wcp:WindowTitleBarButton Name="MinimizeButton" x:Uid="MinimizeButton" VerticalAlignment="Top" Command="{x:Static vsc:ViewCommands.MinimizeWindow}" BorderBrush="{DynamicResource {x:Static ui:EnvironmentColors.MainWindowButtonActiveBorderBrushKey}}" BorderThickness="1,0,1,1" GlyphForeground="{DynamicResource {x:Static ui:EnvironmentColors.MainWindowButtonActiveGlyphBrushKey}}" HoverBackground="{DynamicResource {x:Static ui:EnvironmentColors.MainWindowButtonHoverActiveBrushKey}}" HoverBorderBrush="{DynamicResource {x:Static ui:EnvironmentColors.MainWindowButtonHoverActiveBorderBrushKey}}" HoverForeground="{DynamicResource {x:Static ui:EnvironmentColors.MainWindowButtonHoverActiveGlyphBrushKey}}" HoverBorderThickness="1,0,1,1" PressedBackground="{DynamicResource {x:Static ui:EnvironmentColors.MainWindowButtonDownBrushKey}}" PressedBorderBrush="{DynamicResource {x:Static ui:EnvironmentColors.MainWindowButtonDownBorderBrushKey}}" PressedForeground="{DynamicResource {x:Static ui:EnvironmentColors.MainWindowButtonDownGlyphBrushKey}}" PressedBorderThickness="1,0,1,1" Padding="0,3,0,0" Width="34" Height="26" AutomationProperties.Name="Minimize" AutomationProperties.AutomationId="Minimize" ToolTip="{x:Static vs:MainWindowResources.WindowMinimizeToolTip}" CommandParameter="{Binding RelativeSource={RelativeSource TemplatedParent}}">
        <Path Name="MinimizeButtonPath" x:Uid="MinimizeButtonPath" Width="9" Height="9" Stretch="None" Data="F1M0,6L0,9 9,9 9,6 0,6z" Fill="{Binding Path=(TextElement.Foreground), RelativeSource={RelativeSource Self}}" />
      </wcp:WindowTitleBarButton>
      <wcp:WindowTitleBarButton Name="MaximizeRestoreButton" x:Uid="MaximizeRestoreButton" VerticalAlignment="Top" Command="{x:Static vsc:ViewCommands.ToggleMaximizeRestoreWindow}" BorderBrush="{DynamicResource {x:Static ui:EnvironmentColors.MainWindowButtonActiveBorderBrushKey}}" BorderThickness="1,0,1,1" GlyphForeground="{DynamicResource {x:Static ui:EnvironmentColors.MainWindowButtonActiveGlyphBrushKey}}" HoverBackground="{DynamicResource {x:Static ui:EnvironmentColors.MainWindowButtonHoverActiveBrushKey}}" HoverBorderBrush="{DynamicResource {x:Static ui:EnvironmentColors.MainWindowButtonHoverActiveBorderBrushKey}}" HoverForeground="{DynamicResource {x:Static ui:EnvironmentColors.MainWindowButtonHoverActiveGlyphBrushKey}}" HoverBorderThickness="1,0,1,1" PressedBackground="{DynamicResource {x:Static ui:EnvironmentColors.MainWindowButtonDownBrushKey}}" PressedBorderBrush="{DynamicResource {x:Static ui:EnvironmentColors.MainWindowButtonDownBorderBrushKey}}" PressedForeground="{DynamicResource {x:Static ui:EnvironmentColors.MainWindowButtonDownGlyphBrushKey}}" PressedBorderThickness="1,0,1,1" Padding="0,3,0,0" Width="34" Height="26" AutomationProperties.Name="Maximize" AutomationProperties.AutomationId="Maximize" ToolTip="{x:Static vs:MainWindowResources.WindowMaximizeToolTip}" CommandParameter="{Binding RelativeSource={RelativeSource TemplatedParent}}">
        <Path Name="MaximizeRestoreButtonPath" x:Uid="MaximizeRestoreButtonPath" Width="9" Height="9" Stretch="Uniform" Data="F1M0,0L0,9 9,9 9,0 0,0 0,3 8,3 8,8 1,8 1,3z" Fill="{Binding Path=(TextElement.Foreground), RelativeSource={RelativeSource Self}}" />
      </wcp:WindowTitleBarButton>
      <wcp:WindowTitleBarButton Name="HideButton" x:Uid="HideButton" VerticalAlignment="Top" Command="{x:Static vsc:ViewCommands.CloseWindow}" BorderBrush="{DynamicResource {x:Static ui:EnvironmentColors.MainWindowButtonActiveBorderBrushKey}}" BorderThickness="1,0,1,1" GlyphForeground="{DynamicResource {x:Static ui:EnvironmentColors.MainWindowButtonActiveGlyphBrushKey}}" HoverBackground="{DynamicResource {x:Static ui:EnvironmentColors.MainWindowButtonHoverActiveBrushKey}}" HoverBorderBrush="{DynamicResource {x:Static ui:EnvironmentColors.MainWindowButtonHoverActiveBorderBrushKey}}" HoverForeground="{DynamicResource {x:Static ui:EnvironmentColors.MainWindowButtonHoverActiveGlyphBrushKey}}" HoverBorderThickness="1,0,1,1" PressedBackground="{DynamicResource {x:Static ui:EnvironmentColors.MainWindowButtonDownBrushKey}}" PressedBorderBrush="{DynamicResource {x:Static ui:EnvironmentColors.MainWindowButtonDownBorderBrushKey}}" PressedForeground="{DynamicResource {x:Static ui:EnvironmentColors.MainWindowButtonDownGlyphBrushKey}}" PressedBorderThickness="1,0,1,1" Padding="0,3,0,0" Width="34" Height="26" AutomationProperties.Name="Close" AutomationProperties.AutomationId="Close" ToolTip="{x:Static vs:MainWindowResources.WindowCloseToolTip}" CommandParameter="{Binding RelativeSource={RelativeSource Mode=FindAncestor, AncestorType={x:Type Window}}}">
        <Path Name="HideButtonPath" x:Uid="HideButtonPath" Width="10" Height="8" Stretch="Uniform" Data="F1M0,0L2,0 5,3 8,0 10,0 6,4 10,8 8,8 5,5 2,8 0,8 4,4 0,0z" Fill="{Binding Path=(TextElement.Foreground), RelativeSource={RelativeSource Self}}" />
      </wcp:WindowTitleBarButton>
    </StackPanel>
    <mwtb:FrameControlContainer Name="PART_TitleBarFrameControlContainer" x:Uid="PART_TitleBarFrameControlContainer" DockPanel.Dock="Right" TextElement.FontSize="{DynamicResource VsFont.EnvironmentFontSize}" TextElement.FontFamily="{DynamicResource VsFont.EnvironmentFontFamily}" Margin="0,0,2,0" DataContext="{Binding FrameControls}" />
    <TextBlock x:Uid="TextBlock_1" Text="{TemplateBinding Window.Title}" TextBlock.FontFamily="{DynamicResource VsFont.CaptionFontFamily}" TextBlock.FontSize="{DynamicResource VsFont.CaptionFontSize}" TextBlock.FontWeight="{DynamicResource VsFont.CaptionFontWeight}" TextTrimming="CharacterEllipsis" VerticalAlignment="Center" Margin="0,7,0,4" />
  </DockPanel>
</mwtb:MainWindowTitleBar>

Answer 1

我的原始答案能够检测非客户端鼠标移动，但不能在鼠标离开时检测到。根据OP发现需要使用TrackMouseEvent来执行此操作，我已更新了我的答案，以显示功能完备的示例。

如评论中所述，WPF不处理/包装非客户区事件。我找不到解释为什么。虽然可以使用消息钩检测鼠标移动（因此鼠标输入）。

在VS扩展中，挂钩启动时使用：

IntPtr vsHandle = System.Diagnostics.Process.GetCurrentProcess().MainWindowHandle;
HwndSource source = HwndSource.FromHwnd(vsHandle);
source.AddHook(new HwndSourceHook(WndProc));

支持代码是：

private const int WM_NCHITTEST = 0x0084;
private const int WM_NCMOUSEMOVE = 0x00a0;
private const int WM_NCMOUSELEAVE = 0x02a2;

private enum HtResult
{
    HTERROR = (-2),
    HTTRANSPARENT = (-1),
    HTNOWHERE = 0,
    HTCLIENT = 1,
    HTCAPTION = 2,
    HTSYSMENU = 3,
    HTGROWBOX = 4,
    HTSIZE = HTGROWBOX,
    HTMENU = 5,
    HTHSCROLL = 6,
    HTVSCROLL = 7,
    HTMINBUTTON = 8,
    HTMAXBUTTON = 9,
    HTLEFT = 10,
    HTRIGHT = 11,
    HTTOP = 12,
    HTTOPLEFT = 13,
    HTTOPRIGHT = 14,
    HTBOTTOM = 15,
    HTBOTTOMLEFT = 16,
    HTBOTTOMRIGHT = 17,
    HTBORDER = 18,
    HTREDUCE = HTMINBUTTON,
    HTZOOM = HTMAXBUTTON,
    HTSIZEFIRST = HTLEFT,
    HTSIZELAST = HTBOTTOMRIGHT,
    HTOBJECT = 19,
    HTCLOSE = 20,
    HTHELP = 21
}

[Flags]
public enum TMEFlags : uint
{
    TME_CANCEL = 0x80000000,
    TME_HOVER = 0x00000001,
    TME_LEAVE = 0x00000002,
    TME_NONCLIENT = 0x00000010,
    TME_QUERY = 0x40000000
}

[DllImport("user32.dll")]
static extern int TrackMouseEvent(ref TRACKMOUSEEVENT lpEventTrack);

[StructLayout(LayoutKind.Sequential)]
public struct TRACKMOUSEEVENT
{
    public int cbSize;
    public TMEFlags dwFlags;
    public IntPtr hwndTrack;
    public int dwHoverTime;
}

private bool _trackingMouseMove;
private TRACKMOUSEEVENT _tme;

private IntPtr WndProc(IntPtr hwnd, int msg, IntPtr wParam, IntPtr lParam, ref bool handled)
{
    if (msg == WM_NCMOUSEMOVE)
    {
        if (!_trackingMouseMove)
        {
            _tme = new TRACKMOUSEEVENT();
            _tme.hwndTrack = hwnd;
            _tme.cbSize = Marshal.SizeOf(typeof(TRACKMOUSEEVENT));
            _tme.dwFlags = TMEFlags.TME_NONCLIENT | TMEFlags.TME_LEAVE;
            int success = TrackMouseEvent(ref _tme);
            _trackingMouseMove = (success != 0);
        }

        var hitTestResult = (HtResult)wParam;

        if ((hitTestResult == HtResult.HTSYSMENU) || (hitTestResult == HtResult.HTCAPTION))
        {
            // Raise event here
            System.Diagnostics.Debug.WriteLine("Mouse over title bar");
        }
    }
    else if (msg == WM_NCMOUSELEAVE)
    {
        _trackingMouseMove = false;
        System.Diagnostics.Debug.WriteLine("Mouse left the title bar");
    }

    return IntPtr.Zero;
}